Kim Jong Un’s hint that his country would “reconsider” its moratorium on long-range missile tests gained a bit more oomph last Sunday when it launched an intermediate-range ballistic missile (IRBM). But experts say the latest launch — not to mention the six other tests in January alone — could strain China’s patience as Beijing looks to be the only one launching fireworks when the Winter Olympics kick off later this week.

So far, however, China has been forbearing. After a spate of ballistic missile tests early last month, China and Russia blockeda U.S. push for additional U.N.